CN1131977A - Engine control - Google Patents

Engine control Download PDF

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Publication number
CN1131977A
CN1131977A CN94193537A CN94193537A CN1131977A CN 1131977 A CN1131977 A CN 1131977A CN 94193537 A CN94193537 A CN 94193537A CN 94193537 A CN94193537 A CN 94193537A CN 1131977 A CN1131977 A CN 1131977A
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CN
China
Prior art keywords
rotational
change
rotational speed
fuel
speed
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Granted
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CN94193537A
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Chinese (zh)
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CN1050408C (en
Inventor
乌尔夫·斯文森
乌尔夫·彼德森
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Husqvarna AB
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Electrolux AB
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Publication of CN1131977A publication Critical patent/CN1131977A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2438—Active learning methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2454—Learning of the air-fuel ratio control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires

Abstract

A method and a device for controlling the fuel and/or air supply to an internal combustion engine(1), in the fuel supply section(2) thereof, such as the carburettor or the fuel-injection system, such that the mixture ratio, the air/fuel-ratio, is adjusted automatically to the desired level in response to various operational conditions. In a rotational-speed feed back regulating circuit(3) a feed-back control unit(4) receiving information(5) on the rotational speed from the engine(2) briefly affects an adjustment means(6, 7; 10, 11) to provide a brief change of the mixture ratio, and, in connection with the brief A/F-ratio change, a number of revolution times are measured, and at least one revolution time refers to a rotational speed that is essentially unaffected by the brief A/F-ratio change, whereas at least one revolution time refers to a rotational speed which is affected by the A/F-ratio change, and, on the basis of these revolution times, at least one difference in revolution times between unaffected and affected rotational speeds is computed and based on this difference thus obtained and on stored information the control unit will, as the case may be, affect an adjustment means(6; 10) to change the mixture ratio A/F, in the desired direction.

Description

Engine control
The invention relates to the supply of controlling in fuel supply unit, for example vaporizer or the injection system at internal-combustion engine I. C. engine oil and/or air and regulate the method and apparatus that oil gas mixing ratio reaches ideal value automatically according to different runnabilitys with assurance.
In all internal-combustion engines, gas/oil ratio all is most important engine parameters.Usually gas/oil ratio is called the A/F ratio, A and F refer to air and fuel oil respectively.In order synthetically to reach desirable low oil consumption, low gas emission, good ride quality and high efficiency, A/F is than remaining in the narrower interval, as shown in Figure 3.Usually the A/F of expectation slightly relatively lacks oily side than what be positioned at the ideal efficiency position.The engine exhaust gas discharge amount should be low requirement strict day by day.Under the situation of motor car engine, control the A/F ratio for satisfying the device that these requirements adopt exhaust gas catalyzer and employing to be referred to as " λ " prober and so on.This class sensor special, that is oxygen susceptor or " λ " prober are positioned in the automobile exhaust system.They can detect combustion efficiency on this position, and the result who is derived by the detector measurement value then can be used to control the effect of proportions of ingredients to obtain in control system.The result who is obtained by oxygen susceptor (lambda seeker) need not the direct feedback of any other sensor send back to gas burning system.
But, the benchmark when this sensor (prober) needs an absolute pure oxygen, this is at some motor, for example in fact impossible situation in the motor of power saw.In addition, the control system that is configured to " λ " prober very benzene is heavy, simultaneously this system expensive, complexity and be easy to bring the security of operation problem in many applications.For example say that in power saw, this type systematic will cause volume and weight to increase, and the rapid rising of cost also may cause the security of operation problem.The security of operation problem mainly is to produce because of the sensitivity of installing and connect up.In other words, consumer products, as power saw, hay mower, and the situation of similar products in, this technology is because the reason of installing, also because the reason on cost, efficient and the security of operation is difficult to adopt.The following as expected rules about puffer CO discharge amount may make the vaporizer that is difficult to re-use manual tune.The given fabrication tolerance that under the vaporizer condition, may reach, as adopting fixing nozzle just can not satisfy these legal requirements and guarantee the user simultaneously in air pressure and temperature, the good operation performance under all combined situation of different fuel oil qualities or the like in the vaporizer.To theoretical mixture ratio (A/F) than the several factors that has that exerts an influence.The open No.468998 of Swedish patent application has disclosed a kind of method and apparatus of controlling combustion engine vaporizer.This prior art control system is made up of two regulating circuits.First control unit mainly is constantly a regulating device to be worked to be regulated with the dependence of proportions of ingredients according to the rotating speed of precognition guarantee to mix specific energy, and the latter will obtain through correction and relation rotating speed thus.That is to say the vaporizer curve is corrected that such rectification then is absolute necessary in the control operation.
But, adopt two regulating circuits that separate to control A/F, also increase the danger that produces error simultaneously than than adopting a single regulating circuit can increase complexity and cost naturally greatly.But think that always the function adjusting that will realize actual effect just must two regulating circuits of employing.
Purpose of the present invention is exactly in order to alleviate the problems referred to above greatly, propose a kind of in the fuel feeding part of internal-combustion engine, as the method and the device of the control in vaporizer that is the injection system, to guarantee under different runnability, automatically its A/F ratio being adjusted to desired horizontal to internal-combustion engine fuel feeding and/or air.Do not adopt oxygen susceptor (" λ " prober) for reaching this target.
For achieving the above object, promptly be by method major character of the present invention: in a speed feedback regulating circuit, a feedback control unit by motor reception rotary speed information impels the of short duration change proportions of ingredients of a controlling device momently; Measure a plurality of rotational times relatively with the of short duration variation of this A/F ratio, here so-called rotational time (revolution time) is to be used for indicating the time span of once rotating, for example measured for two blanking times between the firing pulse in succession for each rotational time, and to have a rotational time at least be that relevant this A/F that is not subjected to basically is than the rotating speed of of short duration variable effect, this be mostly the sort of quite early, A/F do not reach the engine speed that has influence on than changing, and has a rotational time at least about being subjected to A/F than variable effect simultaneously yet; Poor according at least one rotational time that these rotational times calculate between the affected and affected rotational speed, and according to this time difference and the information of being stored, control unit will impel a regulating device to change the A/F ratio on aspect desirable rich oil or the few oily mixing when needed, after this adjust in the circuit in speed feedback and repeat this process.In other words, change and control and the basis of the change A/F ratio on aspect desired when forming needs than changing the rotational time that causes according to the of short duration A/F that is analyzed.Be to think the increase of rotating speed in general, that is rotational time shortens, show that this of short duration A/F has obtained the result that proportions of ingredients is improved than change.
According to another kind of improvement the of the present invention, adopt a plurality of, preferably about 4 measure, be not subjected to of short duration A/F basically than changing the relevant rotational time of engine speed that influences, and a plurality of rotational time, be preferably about 4, then relevant with the engine speed that is subjected to this variable effect.Poor according to the rotational time a plurality of, that be preferably 4 that these rotational times are measured between the unaffected and affected engine speed.Adopt several differences to calculate a kind of mean value that reliable control foundation can be provided.
Be further to improve reliability, gather rotational time by the of short duration change of several different proportions of ingredients, these change and generally relate to of short duration few oil and mix, that is reduce the ratio of amount of fuel and air quantity.
The change of the importantly actual like this rotational time difference that obtains and proportions of ingredients is relevant and to change with oiling be that acceleration change is irrelevant.This can utilize various different method of coreection to reach.Such method be gather a plurality of, for example say all rotational times, and their frequencies of occurring changing are made bandpass filtering to rotational time relatively.Because changing, proportions of ingredients generally make the engine revolution time change fast.The rotational time that presents this quick variation (frequency) promptly is received, and the rotational time that presents higher or lower frequency changes then filtered device and isolates out.
To know the method for understanding averaged to variant embodiment's detailed description below, and trimming process, rationality detect or the like.To be beneficial to understanding greatly by flow chart and accompanying drawing to invention.In the following description of the embodiments other features and advantages of the present invention will be described.
By variant embodiment the present invention is done more detailed explanation with reference to the accompanying drawings, adopt same numeral to show same parts in the wherein variant accompanying drawing.
In the described accompanying drawing:
Fig. 1 a is the schematic representation according to control system of the present invention;
Fig. 1 b is the flow chart of expression according to basic control principle of the present invention;
Fig. 2 is the sectional drawing of vaporizer that is applicable to the control system of Fig. 1, and this vaporizer is the view of airintake direction, is mainly used in crankcase oil return two stroke engine for fuel oil;
Fig. 3 is the figure that shows that engine performance changes with Air/Fuel Ratio A/F;
Fig. 4 shows that the engine control fuel oil as the function of the engine revolution number in the carburetor engine compares A/F;
Fig. 5 explanation revolution when motor is essentially few oil and adjusts state is subjected to the situation of influence of the of short duration change of engine air/fuel oil ratio.Enumerate five different of short duration change examples.These changes are cut off engine oil during being meant 1,2,3,4 and 5 engine rotation of each crankcase oil return, vaporizer supply two stroke engine fully;
Fig. 6 and Fig. 5 are suitable fully, and different is that motor is adjusted basically in the rich oil side;
Fig. 7 shows giving an example that rotation number changes in the motor, the influence that it both had been subjected to the of short duration change of air/fuel ratio, the influence that changed by oiling with dotted line.The basic status of the compensation that in the control system this oiling is changed is described with continous curve;
Fig. 8 is the flow chart of principle explanation according to the function of control system of the present invention;
Fig. 9 is the more complete flow chart about a concrete engine control situation.Each rotation of control unit is carried out this process cycle once; With
Figure 10 illustrates the energy supply layout of control system.
In schematic representation 1a, label 1 expression one internal-combustion engine, label 2 is the fuel feeding part of this internal-combustion engine.This fuel feeding part can be for example a vaporizer, i.e. injection system.The change of motor A/F ratio is normally produced engine oil by change.Suppose that motor is a single-cylinder engine, this just can order about one or two and adjust, and promptly adjusts measure 6,7 and reaches.Usually each cylinder all needs its setting device alone.Say that in principle A/F also can be by changing sending out the setting device 6,7 that the air stream of exerting machine works than certainly.Control unit 4 receives the information that shows engine speed by motor 1.Control unit 4 works to a setting device 6,7 at least.Control unit depends on the rotary speed information that is received by motor to the control of setting device 6,7.In other words, control unit 4 is combined in the speed feedback regulating circuit 3.
In having the motor of injection system, control unit 4 sprays into valve to each cylinder control one usually.This sprays into valve can directly be placed in cylinder internal, the direct diesel engine of oiling for example, perhaps can by device with contiguous sucking pipe of cylinder and so in, perhaps in precombustion chamber.What these related to for example is petrol engine or antechamber diesel engine.Carrying out this control is to make regulon 4 of short duration control spray into valve, promptly controls momently by spraying into the flow of valve, perhaps makes throttle down momently.
The state of realizing this of short duration change fuel feeding depends primarily on corresponding engine type.In the crankcase backflow two-stroke engine of vaporizer fuel feeding, fuel oil will take place to mix quite fully from the vaporizer to the cylinder through very long stroke.Can be blocked through several engine revolution for the fuel feeding of vaporizer.In the injected motor that advances each different cylinders of fuel oil, do not produce melange effect.Blocking fuel feeding in this case must be the very of short duration time limit, perhaps only occurs in the very little part of a rotation of motor.This also can be to control proportions of ingredients to control fuel feeding momently.
The basic principle of Fig. 1 b statement control engine air/fuel oil ratio.Beginning changes the A/F ratio momently.This can be by for example saying that of short duration restraining or fuel cut-off carry out.Correspondingly measure a plurality of engine revolution time with this change.These rotational times and the engine revolution time of selecting like this.These rotational times are associated with the engine rotary speed of selecting like this, it is the influence that at least one engine revolution is not subjected to this change, this is an enough previous engine speed mostly, and this A/F has influence on it than changing not reach, for example the rotation 1-4 among Fig. 5 and 6.In principle, also can choose the engine revolution of face after a while, for example rotation between 50 and 100 among Fig. 5 and 6, but this will make the correction rotational time become difficulty widely to reach whole rotating speed change, as below illustrating.At least will select such engine revolution, promptly it is subjected to this of short duration A/F than the influence that changes, for example one of rotation of 20-40 among Fig. 5 and 6.It is poor so just might to calculate the rotational time that is brought because of the change of A/F ratio.According to this time difference, if necessary, proportions of ingredients is changed on desirable few oil or rich oil mixing aspect.Because rotational speed equals 1/ rotational time, still be that the rotational time operation is all passable so rotating speed is pressed by this system.
Fig. 2 is the sectional drawing that is applicable to by the vaporizer of control system of the present invention.Schematically shown this control system.Control system described in Fig. 2 is in several desirable specific embodiments.Misunderstand between general name that relates to setting device 6,7 among Fig. 1 and the label among Fig. 2, the concrete setting device among Fig. 2 is with digital 10,11 marks.
Vaporizer comprises that one has the casing 12 of through-flow channel 13, is illustrated as the vaporizer of seeing from the air through-flow direction.Device has throttle valve 14 and resistance valve is housed when needed in this through-flow channel.In addition, vaporizer also includes a fuel oil chamber, and promptly measuring chamber 16.The latter surrounds a film and adjusts gasoline-saving device.This vaporizer is a diaphragm-type carburettor commonly used fully, therefore here no longer to illustrate in more detail.Oil nozzle 15 pumps into fuel oil chamber 16 by oil pump with fuel oil as the fuel filler of vaporizer.The fuel oil of fuel oil chamber 16 is conducted through a gasoline-saving device thus, and the fuel-economizing effect is realized by an adjustable lever 17.This adjustable lever relies on a direct current motor reciprocating at its axial direction, and this direct current motor makes adjustable lever 17 produce displacement via gear drive 19.By adjustable lever 17, fuel oil is introduced into blocking-up solenoid 11.As a kind of solenoid valve, it or blocking-up are led to the oil stream of through-flow channel 13 or are allowed it pass through.This is a kind of very simple and reliable break-make type solenoid valve.As previously mentioned, fuel oil is wandered about as a refugee and is entered through-flow channel 13 again behind the opening/blocking solenoid 11, at this, does not close as the blocking-up solenoid and promptly to carry out oil spout.Say in principle and blocking-up and throttling function both can be placed setting device 10.The latter is just necessary at that rate can flow with cut-out oil in conducting, and accurately regulates it.
Be mainly concerned with vaporizer in the crankcase oil return two stroke engine for example among Fig. 2, wherein to close several engine revolution long for this blocking-up solenoid.In four stroke engine, adopt the ofer short duration blocking-up cycle, because dilution effect has reduced widely in this case.For of short duration blocking-up fuel feeding, might adopt throttle effect mostly by the film control of a diaphragm-type carburettor.In this case, allow a hypotensive effect pass through to sentinel valve moment, for example produced by the crankcase of motor, this causes of short duration blocking effect.Obviously, vacuum pump can be used for replacing as the step-down source.Might adopt the whole fuel flow of of short duration restraining.If use two regulating devices 6,7; 10,11, then one of them for example blocks solenoid 7; 11, may temporarily control this fuel oil stream, promptly temporarily stop the fuel oil stream of the part in vaporizer or the injection valve.Iff using a regulating device (6; 10), so latter position this remake once of short duration throttling.Measure rod 17 if use a stepping motor to go to handle one, then can make it towards the direction that the increases the restraining effect predetermined step number of advancing momently, and then return.On the other hand, when hope is dammed, so, will make operation surpass required step number and dam effectively, then with the identical step number of reverse direction operation.
Engine fuel is supplied with control and can be summarized as follows.To do more detailed explanation in conjunction with the accompanying drawing flow chart relevant of explanation control base reason with control.Feedback control unit 4 is closed fuel delivery to vaporizer through-flow channel 13 momently by closing blocking-up solenoid 11.In situation about being discussed, that is when a crankcase oil return two stroke engine, the blocking-up solenoid is closed 1 to 5 engine revolution, is generally 3 to 4 engine revolution.Consequently changed the speed of motor.Under the situation of adjusting substantially of few oil, this changes as shown in Figure 4, is that rich oil is adjusted under the situation substantially at motor, then as shown in Figure 7.In other words, accompanying drawing 5 and 6 illustrates the variation of the rotational speed under 5 kinds of different situations separately.The variation of the rotational speed of digital 1 indication curve representation when stopping fuel delivery one engine revolution, and the situation of change the during rotation of curve 2 expressions stopping fuel delivery engine with two, or the like.The information that control unit 4 receives from the relevant rotational speed 5 of this motor.Several rotational times when collecting of short duration blocking-up of relevant combustion supply.Some are not influenced selected these centres by fuel-cut, and some are influenced by fuel-cut.By the velocity variations that the just possible calculation engine of the comparison of influenced and impregnable rotational time is produced because of the fuel-cut face.Because utilize difference between the unaffected and influenced rotational time to try to achieve effect on the rotational speed, this process just can be seen as suitable with calculating mean value.Feedback control unit 4 is analyzed the variation of rotational speeies, and goes order to change the position of adjusting of measuring rod 17 according to this variation and the information of being stored.The realization of this change be by direct current motor 18 through gears 19 at desirable direction shift rod 17 slightly, promptly in other words, can allow less or bigger amount of fuel pass through, in other words, be the proportions of ingredients A/F that reaches rich oil or few oil.
Control system according to Fig. 2 also can be provided with the auxiliary adjustment circuit 8 that is represented by dotted lines among the figure.It comprises an additional control unit 9.In this adjustment circuit, do not have the rotational speed feedback, only be used to finish the adjustment of vaporizer curve.This process is illustrated among Fig. 4 now collaborative this accompanying drawing in more detail and is explained.Usually should auxiliaryly adjust circuit for example is used to adjust oil-filling type, is the rotational speed compliance of the A/F curve of carburetor engine.
Fig. 3 and 4 explanations are according to the Ji Li of the control of the vaporizer fuel feeding motor of Fig. 2.Fig. 3 is the situation of change of explanation engine power with various different air one fuel oil ratios.Characteristic peak dot is masked as the position of best power.In other words, the mixing that produces best power than the mixing situation of heavy wool and less oil under its engine power all to reduce.In general, wish air-fuel oil than be positioned at the ideal efficiency position slightly in oil-poor side, its reason is for obtaining both to have saved fuel oil high-power good double the causing of getting back.
Fig. 4 explanation is in a normal thin membrane type vaporizer, and air-fuel oil is than situation about changing with engine rotary speed.Its uppermost decline deltoid shows so-called " non-coreected cure ", does not wherein do any correction by control system.This A/F is in the rich oil side than curve.And the A/F that wishes is than being a horizontal line of being partial to lack oily side slightly of being represented by dot and dash line.Rotational speed feedback adjusting circuit 3 is reduced to desired level to the A/F curve.Because its shape, it will partly depart from desirable A/F ratio curve.This curve is specified " only by after the feedback compensation " in Fig. 4.It is very effective that this is controlled in the two-stroke power saw engine proof.This point is unexpected, because in order to obtain satisfied result, always think previously and must compare curve by " leveling " this A/F.In Fig. 2, be used for carrying out this smooth just with the indicated auxiliary adjustment circuit of dot and dash line.By this auxiliary adjust circuit make this not the end of coreected cure " have a down dip ", make to obtain straight line basically after calibrated.Under the situation by means of the control of adjusting circuit 3 and 8, it may obtain the curve according to straight dotted line really, promptly desired A/F ratio.This is marked by " after feedback compensation and rotational speed correction " in this figure.
Fig. 5 and Fig. 6 have carried out general discussion in front, will be explained in more detail according to Fig. 8 and 9 flow charts below.
Fig. 7 illustrates the situation of the variation of oiling (loading) that consideration is taken place that is acceleration in the of short duration variation of proportions of ingredients.This dashed curve explanation is because the variation of typical rotational speed in the motor that the of short duration variation of the change of oiling and proportions of ingredients causes.Here can be example with a power saw, the resistance that it is standing increasing and consequently rotational speed landing promptly is exactly " rotational speed changes comprehensively ".Because the of short duration variation of proportions of ingredients is generally few oil mixing and causes that excessive rotational speed landing is greatly within the scope that 10-25 changes.This shows as level and smooth extra having a down dip in downward-sloping.Increase acceleration if replace under the situation of constant oiling, certainly will will allow this curve obtain the upwards trend of an inclination relevant with the of short duration variation of proportions of ingredients.Example among Fig. 7 is equivalent to according to a few oil base of the motor among Fig. 5 situation of originally adjusting.Like this, it is the variation of comprehensive rotational speed that the variation of oiling that is acceleration causes very long, this with cause of short duration rotational speed situation of change different owing to the of short duration variation of proportions of ingredients.Must consider this comprehensive rotational speed variation aspect the variation of rotational speed analyzing because the of short duration variation of proportions of ingredients causes.Accompanying drawing 7 has illustrated a kind of method that realizes this correction.
By about rotating 100 and relatively the proofreading and correct of rotation 1 rotational speed.After this, this rotation rotational speed of 100 is increased to and the par that rotates 1 rotational speed.To be corrected value be added to other rotation with the linear change ratio to the value of this increase after this, that is to say, if be added to rotation 50, then will add half of this corrected value, if be added to rotation 20, then will add 1/5 or the like of this value.It is the curve that the variation of acceleration is corrected continuous straight line that these corrected values have formed change because of oiling.It just in time be equivalent in contrast when if motor is made constant oiling and acceleration and be subjected to the of short duration variation of proportions of ingredients, should obtain curve.In this accompanying drawing, specify r Start=rotation 1 and r End=rotation 100.r StartWith r EndBetween the rotational speed difference be converted into a correction signal, and the latter is by the rotation r that is added to other with the ratio that is changing Endr StartThe equal portions of Jiao Zhenging becomes (r-r fully Start)/(r End-r Start).Here r EndThat proofreaied and correct fully and be transformed and r StartIdentical grade, however the latter does not comprise any corrected value, and r=50 obtains the approximate correction value half.Clearly, the rotational speed of a greater number can be used to provide certain average that is intermediate value, in this case, and r for example StartMay comprise rotation 1-4 and r EndThen comprise rotation number 97-100.
Another method of proofreading and correct rotational time is to rely on the logical conversion of band, that is comes rotational time is made " bandpass filtering " with respect to the change frequency that they presented.In other words, in frequency plane, make bandpass filtering.So just come this dashed curve of conversion, to guarantee that having only those to have near desired speed is the rotational time variation that is impregnable the passing through of rotational speed variation energy of frequency by this class wave filter.Under the situation of lower frequency, for example when the frequency that the variation owing to oiling that is acceleration produces, cause a kind of variation, for example with these vibrations of 20X damping constant " damping is fallen ".The continuous rectilinear curve in the approximate diagram 7 consequently.When the dotted line rectilinear curve also included " interfering frequency " of very high for example measurement interference and so on, because the logical conversion of band, the latter also should be by " damping be fallen ".Certainly, bandwidth also may be selected not by " damping falls " said high frequency, promptly be exactly the characteristic that adopts high-pass filter.Owing to only made the conversion of rotational time curve, all rotational times all still exist.In other words, other parts of control program can with those previous method of coreection of describing in used the same.These two kinds of method of coreection also can be used in combination.
Fig. 8 and 9 is relevant flow charts according to control system of the present invention.Fig. 8 more briefly represents whole control process, and Fig. 9 then more intactly illustrates the process cycle that control unit 4 is once experienced in the every rotation of motor.Because they both is the control about power saw, so the both is to see the foundation that is applied as of the motor that very needs from the control viewpoint.The characteristics of its working environment are load variations and acceleration change fast fast.This just makes the frequent variations of rotational speed.Variation such in many other engine application is very not frequent, for example aircraft and engine of boat and ship.Power saw engine is the two stroke engine of vaporizer fuel feeding crankcase oil return type.In other words, proportions of ingredients, that is the of short duration change of A/F ratio is to be realized by the of short duration cut-out fuel feeding during several engine revolution mostly.More at large, this change may replace by control momently fuel delivery or in addition reach by starting the air of motor supplied with.Comprise that this just means in more common operation is used, particularly during aspect operation, seeing better simply application, simpler shown in comparable Fig. 8 of its flow chart and 9, and be similar to shown in Figure 16.Thereby just can need not to proofread and correct the rotational time that comprehensive rotation speed change and correcting measuring get.Under the situation of more " simply ", can adopt the rotational speed of lesser amt poor for controlling, and exempt reasonableness test.
In view of above-mentioned, the flow chart of Fig. 8 and 9 is discussed now, the total figure among Fig. 8 is as guiding the understanding that is beneficial to flow process shown in Figure 9.First square frame is about " of short duration cut-out fuel oil " among Fig. 8.This rupturing operation be applied to the last week in cycle of discussing interim engine revolution 96,97,98 and 99.See Fig. 5-7.Next square frame is marked as " measuring a plurality of rotational times relevant with cut-out ".Measuring rotation 1-4 in this case is stored in the memory with the rotational time of rotation 29-32 and with these rotational times.With this cut-out (fuel feeding) during the last week interim rotation 96-99 measure explicitly institute in the discussion cycle 4 early rotation 1-4 and similarly also measured 4 rotation 29-32 after a while.Select rotation 1-4 to be because the influence that the cut-out fuel feeding that rotating speed at this moment also is not subjected to just having finished is operated.Be to be noted that in Fig. 5, indicate with flow chart 9 mutually layer cut off fuel feeding in rotation during the 96-99.On the other hand, shown also in this accompanying drawing that the rotary speed that cuts off fuel feeding during rotation 1,2,3 and 5 changes.
Next square frame of Fig. 8 flow chart is " meeting regularization condition? "Have only a condition to satisfy in this stage, determine promptly whether rotating speed is within adjusting between limit region, is 150-200rps in this situation, and promptly per minute 9000-12000 changes.If like this, program is carried out along the direction of adjusting the A/F ratio with regard to continuing.If not so, just will rotate and the rotational time reset-to-zero, be about to measure rotational time suppressed.From the beginning this process carries out once more, and continues within rotating speed becomes between regulatory region.
Referring now to the counterpart of flow chart fully among Fig. 9.From the beginning each rotation of this program is carried out once, its inlet by square frame " firing pulse? " about institute.Try to achieve rotational time and need an igniting pulse signal.When receiving an igniting pulse signal, just will rotate a value added unit.Next square frame " rotation is lower than 5, or between 29 and 32? " in, select 8 rotations so that measure their rotational time and stored.In other words, in the situation for rotation 1, answer will be " YES ", and store its rotational time.Program accent is once more carried out, and stores the rotational time about rotating 2,3 and 4 thus.After this answer and to be " NO ".Next square frame title is " rotation 〉=96? "Answer to rotation 5-28 in this square frame will be " NO ", consequently those square frames of front once more accent carry out.Correspondingly time will be stored when rotating to be No. 29, and rotates 30,31 and 32 also like this.For rotation 33-95, from the beginning program is carried out and is not carried out any measurement along 4 square frames at first.When rotation number is 96, closed 360 ° of solenoid, i.e. motor rotation.Next square frame " rotation=100? ", are " NO " at the answer of rotation 96,97,98 and 99.Promptly from the beginning carry out for the previous section of " NO " flow process as answering, in view of the above, solenoid will be kept closed state during corresponding 4 engine revolution.When the number of rotating to be 100, next square frame will be " rotating speed is within the Accommodation Limits interval ".In this case, between regulatory region 150-200rps, that is per minute 9000-12000 rotation.When answering to " NO ", rotation and rotational time are reset then zero, thus measured rotational time are suppressed and restart this process.At this moment, from the beginning the start-up portion till dotted line of two flow charts is carried out one time.
And then at Fig. 8 this occur below dotted line being marked as " to change because of acceleration and load the comprehensive rotational speed that causes change proofread and correct " square frame.The front has contrasted 7 this process has been described.In accompanying drawing 9, corresponding situation is presented at square frame and " calculates the time of rotation 1 deduction rotation 100, the result is preserved as constant.With rotary reset is zero ".When rotation 100 has been used out-of-dately, be about to rotary reset to zero.This is meant counting rotation 0,1,2 again ... or the like.Thereby when ongoing end cycle, just will begin on stream a new cycle in addition.Similarly this new cycle comprises that collecting a plurality of rotational time data cuts off fuel feeding (solenoid) with doing during 4 engine revolution.Choosing 100 engine revolution in this case is a cycle period, needs the time because engine speed is stablized in the of short duration change back of proportions of ingredients.This Cycle Length is adapted to the potential application of in question motor.Said as the front, and proofreaied and correct fully and will be added to rotation 100, that is last rotation r EndPreferably will rotate 1 and the rotational time difference of rotation between 100 stored as a constant divided by 100 backs.Thereby make that this constant only need multiply by required engine revolution afterwards, that is the engine revolution between 1 and 100.In square frame subsequently, mean value quantity is increased a unit.In this case, mean value is at each cycle, promptly rotates for 0 to 100 interim.
Next square frame among Fig. 9 is the computing that obtains a so-called adjusted value about being.Three different square frames this calculating detects corresponding to the rationality except that last square frame among Fig. 8.This three square frame is:
-" to comprehensive rotation speed change proofread and correct the measurement rotational time ";
-" relatively trying to achieve the speed discrepancy that produces because of cut-out " by what be corrected rotational time; With
-a plurality of rotational time differences are added to (symbol adds) adjusted value (detecting through rationality).
In the calculation block of Fig. 9, at first calculate rotation 1+ constant * zero time.Obtaining the result is zero, because rotate 1 r=r StartIn other words, (r-r Start) divided by (r End-r Start) equal zero.By this do not annotate correction about rotating time (endurance) that 1 rotational time deducts relevant rotation 29 constant * 28 in addition.In this case, this correction exactly become surpass proofread and correct fully 28%.Like this, first row be poorer with respect to A/F than the rotational time of the rotation of a previous rotation that changes and a back.This is the difference between two the rotational times after calibrated, it be one by A/F than changing measuring that the rotational time facilitated changes.In addition one new one previous rotation and the rotation of a back on this value, promptly rotate 2 and rotation 30 between rotational time poor, all overcorrects of this two rotational time.Be carried out about rotating 3 and rotation 31 poor with the same manner, and in addition relevant rotation 4 and rotate 32 difference.These four summations that comprise the rotational time difference of corrected value are used as adjusted value and are stored.
Next step is that rationality detects.This detection generates in according to the flow process of Fig. 9 a specific subroutine." adjusted value is reasonable? be lower than 1200 or surpass-1200 ".In other words, detecting adjusted value is for guaranteeing that it is between upper and lower limit.Be " NO " if answer, adjusted value promptly is configured to reasonable level, the promptly immediate limit (+or-1200).Obviously, also might just adjusted value be dropped to outside the specified limit.But, can improve function if replace adjusted value is set to reasonable level.In present situation, the adjusted value within the exclusion limit, otherwise it is set to value near the limit.
In accompanying drawing 9, then be that square frame " is added to the adjusted value that calculates of morning with adjusted value.This value is total adjusted value by empty title ".In Fig. 8, also produce corresponding square frame is arranged.Each adjusted value all is associated with a certain of short duration variation of proportions of ingredients.Dependence merges several adjusted values several certain mean values of different change calculations of cause proportions of ingredients.Whether the quantity of inquiry adjusted value surpass n (for example 5) in square frame subsequently.This is to say that the quantity of mean value is with good conditionsi, promptly is included in the quantity of the adjusted value in total adjusted value.Adjusted value quantity is big more, and mean value calculation is reliable more.The viewpoint of claim that Here it is.When the quantity of mean value less than 5 the time, this total adjusted value is carried out storage so that be added to next adjusted value.When this flow process just obtained this next adjusted value when from the beginning part was so far carried out one time again.
On the other hand, when total adjusted value comprises more than 5 adjusted values, square frame " total adjusted value＞the highest adjustment limit or total adjusted value＜minimum adjustment limit? " in carry out its size and some limiting value between comparison.Because adjusted value and total adjusted value all also comprise symbol, so relatively these two limiting values are important.Like this, a positive total adjusted value should surpass the highest adjustment limit, and a negative total adjusted value should be lower than the minimum adjustment limit.For example, under situation of the present invention, the highest adjustment limit is set to 1500, and the minimum adjustment limit is set to-750.Surpass any one of prescribed limit value as total adjusted value, then this total adjusted value is stored and is added to following adjusted value, and carries out this process again, so that another adjusted value is added in the summation.
On the other hand, if the sum of adjusted value surpasses 3 nearest limiting values, then answering is YES.So just be directed to the square frame " adjustment of fuel oil.Total adjusted value defines the time that direct current motor moves with the difference of adjusting the limit, and its symbol definition direction ".In this case, between the difference between the total adjusted value and the most approaching adjustment limit, compare.The direction that the symbol definition of difference need be adjusted.Be that rich oil or few oily direction are adjusted so just towards more suitable proportions of ingredients.Clearly, this is very important for the adjustment process that obtains superperformance.The time of this motor operation of the size definition of difference promptly is exactly the amount of required adjustment.Consequently certain adjustment that need control, though not necessarily need fully, useful.For example can replace on correct direction and adjust with predetermined amount.In this case, having carried out amount of fuel promptly is exactly the adjustment of A/F ratio.After this, total adjusted value and mean value number are set to zero.And rotation number is set to zero.Repeat this process then.
The most important base reason of this control is that the calculating by mean value provides reliability on the one hand, and does the correction of comprehensive rotational speed variation aspect on the other hand, and finishes rational check.The calculating that averages with several steps.At first, in each cycle, promptly be exactly engine revolution 0-100, use four in the different differences of different rotary between the time.Then before comparing with the predetermined adjustment limit to 5 adjusted value additions of major general.Each adjusted value is associated with one-period, and to it the intercropping of input timing the correction of comprehensive rotational speed variation aspect.Like this, with the growth that is not fixed of the quantity of adjusting the adjusted value that the limit makes comparisons.Be exactly promptly, when the motor operational excellence, that is has a proper A/F ratio, Zong before adjusted value surpasses an adjustment limit, need a large amount of for example 10 adjusted values mostly.Under this situation, this surplus also is moderate mostly.In other words because direct current motor only moves the cycle of a weak point, so only do little amount of fuel adjustment.On the other hand, if A/F is very more satisfied than not, each adjusted value will be high so, and the total adjusted value when 5 adjusted values is considerably beyond the adjusted value limit.In other words, carry out very big correction in correct direction.This example has clearly illustrated that the advantage of this control principle.
It is fairly simple that the motor overspeed protection is combined with the A/F ratio control system.Its reason is that all necessary equipment of control rotational speed possess.Control unit 4 receives from all rotating speed datas 5 of motor, and can start regulating device 6,7; 10,11 restrainings are to the fuel feeding of motor.Needed only is that a subroutine in the control program is used for the limiting engine rotating speed.In the flow chart of Fig. 9, this subroutine is inserted in by in top the cubic frame, and promptly " rotation 〉=96? (or rotating speed is higher than limit speed ?) "This bracket is meant the part relevant with overspeed protection.This part preferably is included in A/F than in the control, can not but also might not be far from it naturally.When rotating speed is higher than this velocity limit, closed 360 ° of solenoid, i.e. an engine revolution.The problem of next square frame is " rotation=100? ", answering usually is that from the beginning " NO " also carry out part so far in the flow process once more.Still be higher than this velocity limit as rotating speed, solenoid promptly remain closed another rotation of motor during, process is proceeded till rotating speed is no longer greater than the rotation velocity limit.When rotation=100 time, the square frame of following for " is rotating speed within adjustment range? ", answer will be " NO ", the rotation and rotational time is reset to zero and from the beginning carry out program part so far once more.Certainly, refer to here, solenoid is kept closure and no longer is higher than limit speed up to rotating speed.If within adjustment range, control procedure is just carried out towards foregoing adjustment A/F ratio at 100 o'clock rotational times of rotation.
The flow chart of Fig. 9 relates to the two-stroke power saw engine of a vaporizer fuel feeding.In general, various value and the limiting values relevant with rotation are visibly different.Usually, rev limit is subjected to about the restraining of fuel feeding, and this restraining can be different because of various different application on program.Generally speaking, this just means that it is simple and effective adding the overspeed protection function in the A/F control system.Obtaining this overspeed protection function can not cause direct cost to increase.
Fuel feeding partly listens A/F to need operating energy than control.Figure 10 represents a typical application, promptly controls corresponding to the vaporizer of Fig. 2.In this case, borrow rib to cut off fuel delivery momently in cutting off solenoid 11.Usually, this carries out 4 engine revolution length in per 100 rotations at interval, promptly occupy for 4% time.Thereby this solenoid is as a solenoid valve, under the normal condition be open and about 4% being closed when being supplied to energy of doing working time when it.In the power saw of being discussed was used, solenoid was closed near needing 5W.The adjustment of A/F ratio is by setting device 10 controls.One direct current motor 18 orders about an adjustable lever to carry out fuel oil stream is done desirable throttling control.This DC motor 12 adjustment period doing throttling between consumed energy.In the power saw of corresponding diagram 2 and 9 was used, this adjusting per at most 500 just took place when rotating.And when the adjustment generation is slow, 1% when the adjustment time is affirmed less than operation usually.The adjustment period between, the DC motor needs 1W approximately.In addition, this control program also is designed to be the adjustment that guarantees not take place by this DC motor when solenoid is activated.Control unit 4 consumes minimum energy, with cut off that solenoid 11 and DC motor 18 consumed compare almost can give and ignore.
Supply system shown in Figure 10 is primarily aimed at the two-stroke power saw engine of vaporizer fuel feeding, but also can be used to the internal-combustion engine of similar two-stroke or four-stroke or any other pattern naturally, not exert generator general in the machine or battery system as long as it does not have at big.Previous relevant is that the explanation of injection system fuel feeding also is applicable to the energy supplying system that this discusses to vaporizer.If in this control system, adopt a simple setting device,, also can provide energy with the same manner as long as its energy consumption is enough low.
Number 20 indicates one and is used for for example flywheel of the motor of power saw among Figure 10.This flywheel has crooked blade, has dispensed several in the blade for knowing reason.One comprises that the cast-in permanent magnet 21 of south poles is 22,23 encirclements of magnetic core.One integrated unit 24 that is used for the energy of ignition system and control system is positioned in the periphery of flywheel.The section 25 that is surrounded by wire frame is used to the ignition system of motor, is a common structure fully.It includes a primary air and a level coil, and two coil is installed on the corresponding stem stem of an iron core separately, also includes a control circuit in addition.Rely on the rotation of flywheel part 25 to come to provide energy to the spark plug of ignition system.Usually part 25 comprises the iron core that has for two stem stems of strong point ignition system coil.But, this iron core is lengthened out and has the 3rd stem stem 26 in this case.This back one stem stem is provided with its oneself, that is ancillary coil 27, and its two end line is connected to an energy storage unit 28.It is the electronic unit of dc voltage and level and smooth this signal by the AC voltage transformation with being used for voltage signal that unit 28 includes a capacitor that is used for power storage.This energy storage function is a very important function, because this control system only needs " height " power momently.For example, this cut-out solenoid separately need about 5W.On the other hand, coil 27 only provides about 3W, and that Here it is is not enough as noenergy memory cell 28.Figure in the accompanying drawing shows to the unit 28 voltage signal.It is transformed into dc voltage in this element, is used to drive this cut-out solenoid 11, DC motor 18 and control unit 4.The dc voltage signal that arrives control unit 4 also is used to the purpose that triggers, promptly as rotary speed information.It should be noted that the two ends of coil 27 are connected to energy storage unit 28.In other words, avoided the common ground of coil 27 and ignition system coil.This provides reliable input signal to energy storage unit 24, arrives control system 4 again.
Thereby the features of novelty of this electric current supply system just is that electric current is to obtain from a fully independently coil of being done the ignition system module.So be so, because it is to place on the 3rd stem stem of iron core.In addition, whole unit is that casting becomes a plastics compound body and is secured to on-the-spot again with screw.And utilize existing magnetic circuit system in the flywheel.This is very low and the simple and reliable solution of a kind of cost with regard to showing.Because it is interpole coil 27 separates fully with the coil of ignition system, promptly very low to the signal interference level of control system.Control system and electric current supply system are being coordinated aspect several mutually.Control system is designed to be only needs very little energy.So just can utilize simple, reliable and cheap current supply arrangement.Also design to such an extent that make the interference level in the electric current supply function very low in addition.And this current supply arrangement also is used to rotary speed information is offered control unit.

Claims (20)

1. in fuel feeding part (2), for example vaporizer or the injection system of internal-combustion engine (1), control method to internal-combustion engine fuel feeding and/or air; so that its proportions of ingredients; it is the air/fuel ratio; can automatically be adjusted to desirable level according to different operating conditionss; for example reach maximum efficient; most economic oil consumption, perhaps this two purpose any one also collaborative overspeed protection is arranged, it is characterized in that:
In a rotational speed feedback regulating circuit (3), a feedback control unit (4) by motor (2) reception rotating speed data (5) impels controlling device (6,7 momently; 10,11) liken this mixing to of short duration change; The of short duration change of A/F ratio correspondingly therewith, for example rely on a plurality of rotational times are measured in each rotational time measurement two in succession the blanking time between firing pulse, wherein at least one rotational time relates to the rotational speed that not influenced than change by this of short duration A/F, this be mostly one quite early, this A/F is than changing not as good as the engine revolution that influence its rotating speed, and at least one rotational time relates to and is subjected to the rotational speed of this A/F than change; Poor according to the rotational time that these rotational times calculate between at least one unaffected and affected rotating speed; And according to this difference that so obtains with by the information of being stored, this control unit will depend on the circumstances and impel a controlling device (6; 10) with proportions of ingredients A/F with the desirable direction change that mixes towards rich oil or few oil; Whole process repeated in this rotational speed feedback regulating circuit (3) then.
2. the described method of claim 1 is characterized in that:
A plurality of measured rotational times relate to the rotational speed that not influenced than change by of short duration A/F; And a plurality of rotational times relate to the rotational speed that is subjected to the change of A/F ratio; Poor according to the rotational time that these rotational times calculate between several uninfluenced and affected rotational speeies; Utilize several differences to realize certain mean value calculation then.
3. the described method of claim 1 is characterized in that:
A plurality of measured rotational times are preferably about four this times, relate to not being subjected to of short duration A/F basically than changing the rotational speed that influences; And a plurality of rotational times are preferably about four this times, relate to being subjected to A/F than the rotational speed that changes influence; With calculate a plurality ofly according to these rotational times, be preferably about four, rotational time uninfluenced and that be affected between the rotational speed is poor, and each rotational time only is employed once in the calculating of described difference; Be used to successive control with this calculated difference, so that utilize several differences to realize that a kind of mean value calculation obtains the reliable basis of this control function.
4. claim 1 or 2 described methods is characterized in that:
This A/F comprises that than changing one reduces the proportions of ingredients of oil, that is reduces the ratio between amount of fuel and air quantity.
5. any described method in the claim of prostatitis is characterized in that:
At least one measured rotational time relates to a rotational speed r End, 100 among Fig. 5-7 for example, it occur in be subjected to this of short duration A/F than the effect rear engine rotating speed that changes recover stable after; Control unit (4) calculates at least one described rotational time and one and rotational speed r Start, 1 among Fig. 5-7 for example, the difference between the relevant rotational time, this r StartBe enough early, this A/F do not reach rotational speed that has influence on that is rotational time than changing; This difference is used to proofread and correct measured rotational time afterwards, so that they can be carried out correction considering because of for example acceleration change that is the caused comprehensive rotation speed change of changing load.
6. the described method of claim 5 is characterized in that:
Calculated rotational time difference is used to this difference preservation is proofreaied and correct measured rotational time as a constant, and in correction, the rotational time that is not corrected is carried out as r EndThe part r of its engine revolution of forming, that is described part equals (r-r Start)/(r End-r Start), r wherein EndThrough correction fully, thereby be scaled and r StartPeer, and r StartBe not corrected, r=50 is half that is given near the correction in giving an example with Fig. 5-7 is corresponding.
7. any described method in the claim of prostatitis is characterized in that:
Measure a plurality of, for example whole rotational times, then these rotational times are made bandpass filtering with respect to the change frequency that they present, that is on frequency plane, carry out bandpass filtering, and produce the variation on the rotational time curve thus; At this, the slow vibration relevant with the change of load that is acceleration also fallen by open and flat as quick oscillation, approach because of of short duration A/F passes through than the vibration of the speed of the resulting rotational time variation of the result who changes then impregnablely, thereby obtain calibrated rotational time.
8. claim 6 or 7 described methods is characterized in that:
With several, preferably four, the difference phase adduction that relates between the calibrated rotational time of unaffected and affected rotational speed is stored as a so-called adjusted value, this adjusted value is used to control the A/F ratio later on, realizes the calculating about certain mean value of the difference between several rotational times that is corrected thus.
9. the described method of claim 8 is characterized in that:
This adjusted value is relied on check, and whether it carries out reasonableness check between a upper limit and a lower limit, if like this, described adjusted value promptly is used to control the A/F ratio in the back, and if not so, be about to this adjusted value and change to the value of immediate limiting value, and be used to A/F in the back than control.
10. the described method of claim 9 is characterized in that:
A plurality of adjusted values preferably all pass through reasonableness check, are added a total adjusted value, so that come several each all to carry out a kind of mean value calculation with this regulated value that a specific proportions of ingredients of short duration change is associated by this.
11. the described method of claim 10 is characterized in that:
Before described value and the given adjustment limit are compared, should include certain minimum number in this total regulated value, for example five regulated values.
12. the described method of claim 11 is characterized in that:
Regulate the upper limit or be lower than the adjusting lower limit as long as this total regulated value surpasses, just A/F is regulated to change fuel delivery than best, difference between regulated value that this is total and immediate Accommodation Limits determines the size of described change, and its symbol decision direction is promptly mixed still towards few oily Compositing Change towards rich oil.
13. any described method in the claim of prostatitis is characterized in that:
Be combined with an overspeed protection in this A/F ratio control system, control unit (4) is checked the rotational speed speed that whether oversteps the extreme limit, if like this, promptly so that control unit is operated a setting device (6,7; 10,11) control the next time traversal of fuel feeding, for example say, if need to continue the restraining fuel feeding still overstepping the extreme limit speed etc. when rotational speed up to program; And when rotational speed no longer overstepped the extreme limit speed, control unit (4) was promptly operated a location device (6,7; 10; 11) stop this restraining process; and in control unit, continue control to the A/F ratio; so that this overspeed protection action in the two stroke engine of a vaporizer fuel feeding, i.e. this blocking-up solenoid (11) of dependence cut-out makes during the fuel delivery closed of vaporizer or several engine revolution.
14. any described method in the claim of prostatitis is characterized in that:
Whole fuel delivery is cut off momently.
15. the described method of claim 14 is characterized in that:
Whole fuel delivery is cut off a period of time between one and five engine revolution.
16. any described method in the claim of prostatitis is characterized in that:
Mixing in front likens rotational speed after the of short duration change to and repeats the of short duration change of proportions of ingredients A/F after stable, and for example per 100 engine revolution repeat this of short duration change.
17. any described method in the claim of prostatitis is characterized in that:
Except that rotational speed feedback regulating circuit (3), also be provided with the auxiliary adjustment circuit (8) of a non-feeder loop, in described regulating circuit, one Auxiliary Control Element (9) mainly is successive control one controlling device (6), regulate proportions of ingredients so that give the known rotating speed proportions of ingredients dependence of elder generation according to one, thereby make this proportions of ingredients be given an amended rotational speed coherence, for example when different rotational speeies, be essentially a constant.
18. the fuel feeding part of internal-combustion engine; for example the fuel oil that is used for controlling combustion engine in a vaporizer that is the injection system and or the device supplied with of air; make under different runnability; its proportions of ingredients A/F can automatically be adjusted to desirable level; so that obtain for example peak efficiency; or most economic oil consumption, perhaps collaborative have overspeed protection ground to reach these purposes, it is characterized in that:
This device comprises that one is connected at least one controlling device (6,7 with lead; 10,11) control unit (4), the arrangement of described controlling device are the proportions of ingredients that is used for for example controlling with the amount of fuel of regulation and control engine oil part motor; Control unit (4) is connected to an ancillary coil (27) that places on the additional stem stem (26) of an iron core by multiple conducting wires, and described iron core and described ancillary coil (27) are formed in the integrated unit (24) of the energy that is used for ignition system and control system; Receive voltage pulse with described control unit (4) by described coil, this pulse is used to provide control unit (4) and controlling device (6,7 on the one hand; 10,11) electric energy is used to receive rotating speed data (5) on the other hand so that calculate rotational time.
19. the described device of claim 18 is characterized in that:
Control unit (4) is connected to two controlling devices (6,7; 10,11), one of them cuts off solenoid (7 by one, 11) constitute, be used for closing whole momently or part fuel oil stream, second controlling device for example constitutes with the electric motor driven throttle valve of a DC (6,10) by one, and described throttle valve is used for being given desirable throttle degree by control unit (4) operation and produces desirable A/F ratio.
20. claim 18 or 19 described devices is characterized in that:
One energy-storage units (28) is coupling between ancillary coil (27) and the control unit (4), and this energy-storage units (28) comprises at least one capacitor that is used for power storage and is the parts that the AC signal become the DC signal.
CN94193537A 1993-08-27 1994-08-29 Engine control Expired - Lifetime CN1050408C (en)

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CN1050408C (en) 2000-03-15
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JP4006530B2 (en) 2007-11-14
SE9302769D0 (en) 1993-08-27
WO1995006199A1 (en) 1995-03-02
DE69416596D1 (en) 1999-03-25
US5709193A (en) 1998-01-20
US5809971A (en) 1998-09-22
DE69416596T2 (en) 1999-09-02
JPH09502004A (en) 1997-02-25

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